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Linux/arch/arm/include/asm/memory.h

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  1 /*
  2  *  arch/arm/include/asm/memory.h
  3  *
  4  *  Copyright (C) 2000-2002 Russell King
  5  *  modification for nommu, Hyok S. Choi, 2004
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10  *
 11  *  Note: this file should not be included by non-asm/.h files
 12  */
 13 #ifndef __ASM_ARM_MEMORY_H
 14 #define __ASM_ARM_MEMORY_H
 15 
 16 #include <linux/compiler.h>
 17 #include <linux/const.h>
 18 #include <linux/types.h>
 19 #include <linux/sizes.h>
 20 
 21 #ifdef CONFIG_NEED_MACH_MEMORY_H
 22 #include <mach/memory.h>
 23 #endif
 24 
 25 /*
 26  * Allow for constants defined here to be used from assembly code
 27  * by prepending the UL suffix only with actual C code compilation.
 28  */
 29 #define UL(x) _AC(x, UL)
 30 
 31 /* PAGE_OFFSET - the virtual address of the start of the kernel image */
 32 #define PAGE_OFFSET             UL(CONFIG_PAGE_OFFSET)
 33 
 34 #ifdef CONFIG_MMU
 35 
 36 /*
 37  * TASK_SIZE - the maximum size of a user space task.
 38  * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
 39  */
 40 #define TASK_SIZE               (UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
 41 #define TASK_UNMAPPED_BASE      ALIGN(TASK_SIZE / 3, SZ_16M)
 42 
 43 /*
 44  * The maximum size of a 26-bit user space task.
 45  */
 46 #define TASK_SIZE_26            (UL(1) << 26)
 47 
 48 /*
 49  * The module space lives between the addresses given by TASK_SIZE
 50  * and PAGE_OFFSET - it must be within 32MB of the kernel text.
 51  */
 52 #ifndef CONFIG_THUMB2_KERNEL
 53 #define MODULES_VADDR           (PAGE_OFFSET - SZ_16M)
 54 #else
 55 /* smaller range for Thumb-2 symbols relocation (2^24)*/
 56 #define MODULES_VADDR           (PAGE_OFFSET - SZ_8M)
 57 #endif
 58 
 59 #if TASK_SIZE > MODULES_VADDR
 60 #error Top of user space clashes with start of module space
 61 #endif
 62 
 63 /*
 64  * The highmem pkmap virtual space shares the end of the module area.
 65  */
 66 #ifdef CONFIG_HIGHMEM
 67 #define MODULES_END             (PAGE_OFFSET - PMD_SIZE)
 68 #else
 69 #define MODULES_END             (PAGE_OFFSET)
 70 #endif
 71 
 72 /*
 73  * The XIP kernel gets mapped at the bottom of the module vm area.
 74  * Since we use sections to map it, this macro replaces the physical address
 75  * with its virtual address while keeping offset from the base section.
 76  */
 77 #define XIP_VIRT_ADDR(physaddr)  (MODULES_VADDR + ((physaddr) & 0x000fffff))
 78 
 79 /*
 80  * Allow 16MB-aligned ioremap pages
 81  */
 82 #define IOREMAP_MAX_ORDER       24
 83 
 84 #else /* CONFIG_MMU */
 85 
 86 /*
 87  * The limitation of user task size can grow up to the end of free ram region.
 88  * It is difficult to define and perhaps will never meet the original meaning
 89  * of this define that was meant to.
 90  * Fortunately, there is no reference for this in noMMU mode, for now.
 91  */
 92 #define TASK_SIZE               UL(0xffffffff)
 93 
 94 #ifndef TASK_UNMAPPED_BASE
 95 #define TASK_UNMAPPED_BASE      UL(0x00000000)
 96 #endif
 97 
 98 #ifndef END_MEM
 99 #define END_MEM                 (UL(CONFIG_DRAM_BASE) + CONFIG_DRAM_SIZE)
100 #endif
101 
102 /*
103  * The module can be at any place in ram in nommu mode.
104  */
105 #define MODULES_END             (END_MEM)
106 #define MODULES_VADDR           PAGE_OFFSET
107 
108 #define XIP_VIRT_ADDR(physaddr)  (physaddr)
109 
110 #endif /* !CONFIG_MMU */
111 
112 /*
113  * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
114  * locations
115  */
116 #ifdef CONFIG_HAVE_TCM
117 #define ITCM_OFFSET     UL(0xfffe0000)
118 #define DTCM_OFFSET     UL(0xfffe8000)
119 #endif
120 
121 /*
122  * Convert a physical address to a Page Frame Number and back
123  */
124 #define __phys_to_pfn(paddr)    ((unsigned long)((paddr) >> PAGE_SHIFT))
125 #define __pfn_to_phys(pfn)      ((phys_addr_t)(pfn) << PAGE_SHIFT)
126 
127 /*
128  * Convert a page to/from a physical address
129  */
130 #define page_to_phys(page)      (__pfn_to_phys(page_to_pfn(page)))
131 #define phys_to_page(phys)      (pfn_to_page(__phys_to_pfn(phys)))
132 
133 /*
134  * PLAT_PHYS_OFFSET is the offset (from zero) of the start of physical
135  * memory.  This is used for XIP and NoMMU kernels, and on platforms that don't
136  * have CONFIG_ARM_PATCH_PHYS_VIRT. Assembly code must always use
137  * PLAT_PHYS_OFFSET and not PHYS_OFFSET.
138  */
139 #define PLAT_PHYS_OFFSET        UL(CONFIG_PHYS_OFFSET)
140 
141 #ifndef __ASSEMBLY__
142 
143 /*
144  * Physical vs virtual RAM address space conversion.  These are
145  * private definitions which should NOT be used outside memory.h
146  * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
147  *
148  * PFNs are used to describe any physical page; this means
149  * PFN 0 == physical address 0.
150  */
151 #if defined(__virt_to_phys)
152 #define PHYS_OFFSET     PLAT_PHYS_OFFSET
153 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
154 
155 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
156 
157 #elif defined(CONFIG_ARM_PATCH_PHYS_VIRT)
158 
159 /*
160  * Constants used to force the right instruction encodings and shifts
161  * so that all we need to do is modify the 8-bit constant field.
162  */
163 #define __PV_BITS_31_24 0x81000000
164 #define __PV_BITS_7_0   0x81
165 
166 extern unsigned long __pv_phys_pfn_offset;
167 extern u64 __pv_offset;
168 extern void fixup_pv_table(const void *, unsigned long);
169 extern const void *__pv_table_begin, *__pv_table_end;
170 
171 #define PHYS_OFFSET     ((phys_addr_t)__pv_phys_pfn_offset << PAGE_SHIFT)
172 #define PHYS_PFN_OFFSET (__pv_phys_pfn_offset)
173 
174 #define virt_to_pfn(kaddr) \
175         ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
176          PHYS_PFN_OFFSET)
177 
178 #define __pv_stub(from,to,instr,type)                   \
179         __asm__("@ __pv_stub\n"                         \
180         "1:     " instr "       %0, %1, %2\n"           \
181         "       .pushsection .pv_table,\"a\"\n"         \
182         "       .long   1b\n"                           \
183         "       .popsection\n"                          \
184         : "=r" (to)                                     \
185         : "r" (from), "I" (type))
186 
187 #define __pv_stub_mov_hi(t)                             \
188         __asm__ volatile("@ __pv_stub_mov\n"            \
189         "1:     mov     %R0, %1\n"                      \
190         "       .pushsection .pv_table,\"a\"\n"         \
191         "       .long   1b\n"                           \
192         "       .popsection\n"                          \
193         : "=r" (t)                                      \
194         : "I" (__PV_BITS_7_0))
195 
196 #define __pv_add_carry_stub(x, y)                       \
197         __asm__ volatile("@ __pv_add_carry_stub\n"      \
198         "1:     adds    %Q0, %1, %2\n"                  \
199         "       adc     %R0, %R0, #0\n"                 \
200         "       .pushsection .pv_table,\"a\"\n"         \
201         "       .long   1b\n"                           \
202         "       .popsection\n"                          \
203         : "+r" (y)                                      \
204         : "r" (x), "I" (__PV_BITS_31_24)                \
205         : "cc")
206 
207 static inline phys_addr_t __virt_to_phys(unsigned long x)
208 {
209         phys_addr_t t;
210 
211         if (sizeof(phys_addr_t) == 4) {
212                 __pv_stub(x, t, "add", __PV_BITS_31_24);
213         } else {
214                 __pv_stub_mov_hi(t);
215                 __pv_add_carry_stub(x, t);
216         }
217         return t;
218 }
219 
220 static inline unsigned long __phys_to_virt(phys_addr_t x)
221 {
222         unsigned long t;
223 
224         /*
225          * 'unsigned long' cast discard upper word when
226          * phys_addr_t is 64 bit, and makes sure that inline
227          * assembler expression receives 32 bit argument
228          * in place where 'r' 32 bit operand is expected.
229          */
230         __pv_stub((unsigned long) x, t, "sub", __PV_BITS_31_24);
231         return t;
232 }
233 
234 #else
235 
236 #define PHYS_OFFSET     PLAT_PHYS_OFFSET
237 #define PHYS_PFN_OFFSET ((unsigned long)(PHYS_OFFSET >> PAGE_SHIFT))
238 
239 static inline phys_addr_t __virt_to_phys(unsigned long x)
240 {
241         return (phys_addr_t)x - PAGE_OFFSET + PHYS_OFFSET;
242 }
243 
244 static inline unsigned long __phys_to_virt(phys_addr_t x)
245 {
246         return x - PHYS_OFFSET + PAGE_OFFSET;
247 }
248 
249 #define virt_to_pfn(kaddr) \
250         ((((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT) + \
251          PHYS_PFN_OFFSET)
252 
253 #endif
254 
255 /*
256  * These are *only* valid on the kernel direct mapped RAM memory.
257  * Note: Drivers should NOT use these.  They are the wrong
258  * translation for translating DMA addresses.  Use the driver
259  * DMA support - see dma-mapping.h.
260  */
261 #define virt_to_phys virt_to_phys
262 static inline phys_addr_t virt_to_phys(const volatile void *x)
263 {
264         return __virt_to_phys((unsigned long)(x));
265 }
266 
267 #define phys_to_virt phys_to_virt
268 static inline void *phys_to_virt(phys_addr_t x)
269 {
270         return (void *)__phys_to_virt(x);
271 }
272 
273 /*
274  * Drivers should NOT use these either.
275  */
276 #define __pa(x)                 __virt_to_phys((unsigned long)(x))
277 #define __va(x)                 ((void *)__phys_to_virt((phys_addr_t)(x)))
278 #define pfn_to_kaddr(pfn)       __va((phys_addr_t)(pfn) << PAGE_SHIFT)
279 
280 extern phys_addr_t (*arch_virt_to_idmap)(unsigned long x);
281 
282 /*
283  * These are for systems that have a hardware interconnect supported alias of
284  * physical memory for idmap purposes.  Most cases should leave these
285  * untouched.
286  */
287 static inline phys_addr_t __virt_to_idmap(unsigned long x)
288 {
289         if (IS_ENABLED(CONFIG_MMU) && arch_virt_to_idmap)
290                 return arch_virt_to_idmap(x);
291         else
292                 return __virt_to_phys(x);
293 }
294 
295 #define virt_to_idmap(x)        __virt_to_idmap((unsigned long)(x))
296 
297 /*
298  * Virtual <-> DMA view memory address translations
299  * Again, these are *only* valid on the kernel direct mapped RAM
300  * memory.  Use of these is *deprecated* (and that doesn't mean
301  * use the __ prefixed forms instead.)  See dma-mapping.h.
302  */
303 #ifndef __virt_to_bus
304 #define __virt_to_bus   __virt_to_phys
305 #define __bus_to_virt   __phys_to_virt
306 #define __pfn_to_bus(x) __pfn_to_phys(x)
307 #define __bus_to_pfn(x) __phys_to_pfn(x)
308 #endif
309 
310 #ifdef CONFIG_VIRT_TO_BUS
311 #define virt_to_bus virt_to_bus
312 static inline __deprecated unsigned long virt_to_bus(void *x)
313 {
314         return __virt_to_bus((unsigned long)x);
315 }
316 
317 #define bus_to_virt bus_to_virt
318 static inline __deprecated void *bus_to_virt(unsigned long x)
319 {
320         return (void *)__bus_to_virt(x);
321 }
322 #endif
323 
324 /*
325  * Conversion between a struct page and a physical address.
326  *
327  *  page_to_pfn(page)   convert a struct page * to a PFN number
328  *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *
329  *
330  *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
331  *  virt_addr_valid(k)  indicates whether a virtual address is valid
332  */
333 #define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
334 
335 #define virt_to_page(kaddr)     pfn_to_page(virt_to_pfn(kaddr))
336 #define virt_addr_valid(kaddr)  (((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory) \
337                                         && pfn_valid(virt_to_pfn(kaddr)))
338 
339 #endif
340 
341 #include <asm-generic/memory_model.h>
342 
343 #endif
344 

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